Forget monotonously marching up and down aisles tossing food into your cart one cereal box and frozen dinner at a time. A new delivery service lets you do it from home. Beginning Tuesday, people in metro Denver can use Instacart, an online grocery delivery service, to order their groceries from King Soopers and Costco and have them delivered in as little as one hour. "We are very excited to give people in Denver access to healthy groceries on demand," said Apoorva Mehta, Instacart founder.